Three Rocks, California has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 50.8 °F (low) to 76.5 °F (high). Annual precipitation averages 7 Inches. Three Rocks is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.6 °F | 56.0 °F | 1.57 in. |
| February | 41.5 °F | 61.7 °F | 1.36 in. |
| March | 44.6 °F | 68.0 °F | 1.13 in. |
| April | 47.6 °F | 74.4 °F | 0.52 in. |
| May | 54.3 °F | 82.6 °F | 0.32 in. |
| June | 59.6 °F | 91.1 °F | 0.15 in. |
| July | 65.1 °F | 97.1 °F | 0.0 in. |
| August | 64.1 °F | 95.2 °F | 0.0 in. |
| September | 60.2 °F | 89.9 °F | 0.05 in. |
| October | 52.8 °F | 79.7 °F | 0.3 in. |
| November | 43.8 °F | 66.0 °F | 0.53 in. |
| December | 37.9 °F | 56.4 °F | 1.09 in. |
| Annual | 50.8 °F | 76.5 °F | 7.02 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BWk - Cold Desert Climate |